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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a067a40366220e994aa51da40a08b4bc858741e896e99d218967010c562c566b' 
  AND token = 'KszSY5o8LP/3P03E1GhANL+O4Psx5kQBEICPcldKUM4=' 
  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"
    }
  }
}