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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eaee92523f61238f4aef4fd8f7532d12964c81b1964c7f4e8aaee2f849997b96' 
  AND token = 'ogTloefJCGru6XMVQqZcXS4DTkqGShqrkNpTZO/0/ws=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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