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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bf15736e6f7852bd829bb0c52fc8019d23fd3b61abc93f55869c52d299a410f9' 
  AND token = 'EqGR4c/qdomYEdCnQKKUMN+PiEm3qfH7mBr9xRnWlAY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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