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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '015f5b539b1a25c6d056bd25347d2c7880c7f97376601f43e5401146b4726464' 
  AND token = 'JzFxf4fFkVxOh/NIn+v1C3gkR93IrAqUWtrzl+xR4P4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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