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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1cbdc4efabf03b0813974ad31a28c2a3f497142fabd2bbf2ba774a76d90d4d93' 
  AND token = 'Ic6JNQAvxyjxJJcpxo9/GFkggCsxkeSM5mJYSi7cPHc=' 
  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"
    }
  }
}