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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2c3a44749ef38684c0f9779457c1a7edf9d8c56ba229d76c26b54ec12cad6645' 
  AND token = 'FRjLTCXzSI4pMNiiH1J91+UjZ9fWn4ZibMyFMPHWzig=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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