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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0ce4609a92f6295dca8b57f1187ba8d9af3ad91a7067bc54b38c2b3c315742f4' 
  AND token = 'WyDwlZ6hmZ3BiTuv687OJBSx4ZZQfjAsm2r5fICxSA8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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