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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fe91617272445051da5da714bcec3fe40ad60c09dbc4010e8db0dfede7850fc1' 
  AND token = 'X8kKmcqnFJ90FeJhgo4mHknuuC8QSc2r0TBbhZwBkVc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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