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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9518378149b61c8842e2fae72e5fdd2ca0901edd4754cdd8b6eb3269c1104a04' 
  AND token = 'a0XI9LWfxwrHdx+I6QMG6na9MEukv7shZO7Ty4G7bg4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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