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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '869a0a7a85383d92111eb8670a49be1fdbe1a20c946bda1d0c7c7e5fbd64600d' 
  AND token = 'ngDKUNwA03NU91Jj88gktTg/1GHve8MvoK8yj8K4/2E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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