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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '72e8a8f630844e48323955f99b63c3772420619b7fb7f1eaf1cf004603f30a94' 
  AND token = '3f+wxwpqZsBAZUQQ0+DWOrEbncEzPGlknHliFK3fcRQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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