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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1f1d9a0ed85ccd8ed156cc7a5d7d068028420e1ae4dd0e11ace7b222704ea7bb' 
  AND token = 'cJ3fGFRAkUESykWimf4BaxkaYFY2BpBChj6xSTMeSkY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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