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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b20f66b1ce00100141b247c3e19f9a51dac68dbdb7a558e70d954726672684d4' 
  AND token = 'gS7Bg0cCtMQgcvAciyPveFERn2dW2MpNaz/ybbEUsDg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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