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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5154b05f42f23d84b5abd05867a37fa914a1f7f214b0218c4753f1fb3133f62d' 
  AND token = 'cbh4Nv7e4B1e7ZfnGQB0iwq0Y17HuAnywWBI+2jFwn4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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