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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8b5f24bb9ba03eeaad2536c2d98d205ef7880ff7c5bced410bb3a86fd7572035' 
  AND token = '4+6HjcVZXJcfB/G0t8Ss/kpJ/maQE2Z7NZobfqtK2KE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}