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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd8f9fbd63ea8681e3f4232e215f3de81a4da6c28c6b4c79220ac4d74c12c7bd3' 
  AND token = 'UfbL46d5/98aDnqF6fMm2H/UWDcZJOyHeCRstnfhZgw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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