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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c099c6a9c98ca1d0c2e88c5b6accd329e0c2bc28d8e6ad7b532ed64643952102' 
  AND token = '+jK+itBCQaJIkHTV1EurirXaix18/ou7tJ3OGVXLhEg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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