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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a9006ef527058d4423cf92ceb9e53f3a3d578da27e4f106b6b60bdacca1f10cc' 
  AND token = '2uqBZj5loO4d3tJW9JnC4Na+2NAAQDwJewonWCweG0k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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