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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ea6cf632437d955578f9204e6a852c0c85fb728a8b9a457d513b7cd9d161cbf9' 
  AND token = 'DrwiVCII/FzkOM0iYXpb79LYswFWYfpbjrsCAEWAvks=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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