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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6d0d05e4ea347256f61cf7ed49c64d7dfce47dff4df62d4623522f0ce29561e8' 
  AND token = 'GsceTTmism4gdiUTR6vH5gZSrGYv3Jwl0ekeouUXAaA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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