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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '857f79822dee26b037b918e804f9cd4d3ffeace418b62e1f23308a5da0ff492b' 
  AND token = 'Ugf/lmqSTc/roWHZORmV4OFw4JbkleLcQx8zt7bGNu8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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