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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ebf9b558e01ea09690749f15373a108f96cde1912b89cbba203081626a7618e8' 
  AND token = 'lJD8N4oIllahPohEyJDt50UVC4ih1Wb7XA0+ci9WrgE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00203

JSON explain

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