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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2685c856d2616b133edd04d9c80f76fee5d46ebbe4cc9d514bc434e8501ba657' 
  AND token = '8HKqiCUNkq+WZ4Haz4YQjdYgWep8p7AUTGm5HO3ieME=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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