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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e1a114cd85e10be4fbed617b03b96a1a65e8ca12d42a370c4e21c27a017f0418' 
  AND token = '3IgjVFfDEQCaUi7kvjNTNIS3MjU/O5qr4lJ068V8BE8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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