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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '610cbf61779e8b0fbd2aef8e568abe2c5035d526e29760b31b0dc433a45e956d' 
  AND token = 'Vvmk9ckUJVmKOaIDLs238jyb4NK5SKmg1Qvw1qghsrk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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