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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ea27c332028046217705379edb9c817feb741ced70963a8043f2ea64739d0c97' 
  AND token = 'ljzEMFyu4mSs79YjW/v+13Ec/acjBbvJ2jgQ1Bjqf+U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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