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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c0e12806f0ed89c8497a3cec4439f32fee1fdc1a48fe9a6fc27aee90d33c32c3' 
  AND token = 'DHm8sW/m8Y8oWp+FX8fj9caCmaNzE69+t9TVcwnRPbw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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