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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ae61ddeb480cab849547c8df467e1be1bd95456c56d654ca0711054ea2c4feaa' 
  AND token = 'aWW/VEnagM4ejzfhhTptnkZD3AXS7GXhjvmcNW+5kX8=' 
  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"
    }
  }
}