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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c3f8ea6a915b0c596fce775f1ec65dfe4cddeea7e2c32f7efa1e54e0b85db649' 
  AND token = '5jFuY7FVDInrQu7D7UQER83Ut+5dHnX41CrSY1GQANE=' 
  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"
    }
  }
}