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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bc6aa3ee48e3e8c4710190ba859c9836757a2c1e87ba05581438aaebc23024d2' 
  AND token = 'c07kI5MU3FyHPuJmp10ntS1kNp4Fv1JuQxD7q7dhVfg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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