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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cb66054c0a5b9e41acfd3b1665fc6f2bcbb5183ba53a8bb2c34df91aec4a7fb2' 
  AND token = 'b/eRmucg/rQKalHKvVylGdxgpaNahVs9UQyxAy/6xGc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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