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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6789670073a4e9d894a5e95b22b41c5f4cca7b9166fdb6ddf8e917ec86cf0b4c' 
  AND token = 's61Z+f6fXPJwk9xVS+LlmYrp8HtzXtkL3ORg7lJffiQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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