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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '16269cb05352d0b071ff81765dc5b5001a849c2a74b827aedfc2aa19322e27aa' 
  AND token = 'b6k2KtiRJtR+0QLEx6BQ1HpdSgGEOmn9p323OeQWkPs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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