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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '23644b0bf01a6253e5e984c4b690c3b69c3d5805c31b9eaa24336f1c2d080353' 
  AND token = '4zlAcisnHaYC6hbDcVr/CTAtQniGH4z2wNIUD64RJNo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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