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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ce7ea6a4e5d0fce3511f707a4323b5e7ba5f1139f4f50d0ad769111cb9607907' 
  AND token = 'NePODTY0X/3/GC/c+G00pPrzV3lAWEJxnRVrQJ2Pic0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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