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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '12aef74f7268b161ba37dc8eb82d41e551fdeb34443abc6d0cefde9136e2dee5' 
  AND token = 'V2MQso4CjYoUxiTRhzKT7ac7CgSkLv8y9LpUfG7zSxc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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