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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2b613990e5903b5e25faa97284c5b2e6783a4fef5ed6fecb0e2a1312e57ed968' 
  AND token = 'Lc04sh/3lsfF3go7oDLhgKGE6Anat9KkR1LaJ62tCwc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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