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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1b06df59bee25db4d2fa74d3067881f8a32fd6bb2b2316cdfd351b0c611f4bd9' 
  AND token = 'QiPblXEeoTY+jTwCUGQlMHPIbvPxeU/p1xj2aRFI5ZA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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