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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '249b7b045bee69c5544111e2318d22c97f7de422f24bd2a89c84c00ac52a6f82' 
  AND token = 'PMkbdOaG0eUr4IrWJ5qz+mkoNmlmuYp4tAzESY7vYN0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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