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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3d220703232b89236da09ce8f2d89ffb4e2d783128b8f37f2d88d6b75ab26939' 
  AND token = 'vO725FR+nhPTEi1pvuEcGJdmpi6WTZCagQ+mq5Ja7YI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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