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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2b9bec5ee97419c86e94bce6474aecefd671a413cab98db5e8836b60d9cd13fb' 
  AND token = 'fCZ7/42lTP+vQstH0tB+yP81zLTvG1RSjaPdmIWL92o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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