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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '17f7da00fcdc53cf0c4ad4eb61f599241a60eac4abb90f8a1f0e12000aad14c6' 
  AND token = '8sp9dtTC/GRRqMGwIQTw/ziQKI4vhM4MUzHM8rIKrN8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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