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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3371a264c1e6c9a8f82e7f9d5de39a2bbd3af85ab3cb69941b64c3011847a435' 
  AND token = 'wWBuyQZqfFn0jnp4PujP6a/YicPt11yVWk09CVUF3Js=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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