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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cf39581315047ded8c0c7fe2fc723e68f252545c5d27e3b76fd4835c5cf59439' 
  AND token = 'wrbiLZMAvOMJQeE4NJ8nF0LrgENaw6R3DUMMNtt3OXg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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