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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '40d93643b9b9d608cb4f32bb9d3cfbd6722b2494c77f87b76c5db136275658e0' 
  AND token = 't3MTMGGGiaj5nLHvqtsueBHHfrZ+Q1g53V42i6kdoFY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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