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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '26c55ee1b3c902085d863262079e7e68670a7c12ed5571ea48bc9890c0e1cb0b' 
  AND token = 'f/gD7mV7vOQbyZNOQm9qeuUfQPzKFacO0/DZEP63j5U=' 
  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"
    }
  }
}