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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0d2d0f58b9e9a01f0431d6b390eb9fc273bac2ff7293364cc20a859d3fc5af12' 
  AND token = 'lgv9FvWsW4R4iZ/Q+DLnZSkIlX3+5rmcq5fZJsac/jI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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