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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd555997a3459e094355dc9d5cd490e3cf811a46547df8799b4bcea64561ab141' 
  AND token = 'jKRuKDEGeLh0bT6uio0OVh9H/OKSeg6uMtei8gRwft8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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