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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '17ebc885a9af77ab4e9431790c8e950f24bafd2ef2710393c8afe83d04ddd2a8' 
  AND token = '1x8ivHZG6VL0EdGLWX2Al2NumHsmbtApb/ObOlPmqm4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00010

JSON explain

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