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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9d2cbd854af4ad9d46c6a702201bee1f935c036b3066e76d9aec47652e15f225' 
  AND token = 'fxtXsa2Ud7m+JjT2omSF69d2u3Te/i4bWqoeAAx6qPE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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