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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '62f468f53f7133d750196cf84f0ba7cd7c2d7d356ee1f2e18d050b315f014d03' 
  AND token = 'OtWEtx4U42Vq1Hf+equ29uLTVrLgGjPEMtyTnKkkKPo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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