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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a77814b0b7e61b9904b2f8970268b2e3f943d40bd97f51b64dcca2a17af3eadf' 
  AND token = 'fE8l8F7ifrRGkn3s4StZJuLRLqClMxxu1kdJJKon+Yk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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