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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ab68320e473e955a3b32a7aae9ebeb195471a4dc600542c09f988e47c6d0f822' 
  AND token = '3IJWh+N16iWgDjuh8k8FZNm9ixtpQm4jusc7otphnw4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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