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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '840068832ea9409bd323cd9c4221bbf4be178784bd7c2e05f83bc96ab5b9bc8e' 
  AND token = 'FWoCikHJ4CtlNjkxIODdeLsTn37vol3OLs1YMCw5z1I=' 
  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"
    }
  }
}