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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0a5b7f03acae8977d542cc08b84c3ff29df99eb65e7d663209afa1853c9bc2dd' 
  AND token = 'Aa6YskArdRPIutf4shtuF6PSNyOOq/ea4cc0QPhJpFc=' 
  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"
    }
  }
}