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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7a199ef46a2be0291e48ecbd45dbcb1b34bfea18011c7450d5a30fc28047558b' 
  AND token = 'bYY5EhM0ELWMweSeVSamYFpI48BcW4TaGq0o8iKU0H4=' 
  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"
    }
  }
}