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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2515c932518143a93b29471ef4d9e50d11ffe96a76e92fb47daaabccddec0c48' 
  AND token = 'VBJF/TFw/HxJA2IVizWvvjkxoxXR4Z4M1hIDtl99oMo=' 
  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"
    }
  }
}