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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f99a73d5d4eb9e81deab32de5060ed7cc5d1bc4098921349c756fcfa7883baa9' 
  AND token = '2n+7WFP9oC33PP/dOhWdxmAsEEW/kUM3NGVE4KmLi4A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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